I have experienced random bouts of unresponsive touch screen on our 2017 Ford Edge. Everything is working, you just can't get the screen to respond. You can do voice commands, so the background function(s) are working. Sometimes it will start working again and then stop again.
I found that (frustration) that a sharp knock to the screen with your knuckle will a lot of times free it up, usually not permanently . It may not happen for a while and then it comes back.
I found reference to a Ford SSM - Special Service Message. Ford SSM 47167
2016-2017 Ford And Lincoln Vehicles Equipped With SYNC 3 - Touchscreen Unresponsive.
From what I understand, this means it is a multiple reported problem, but there may be no known solution yet.
​Wondering how many people are experiencing this or have any more information.